The world's last unexplored frontier - the ocean - could soon be home to swarms of tiny submarines, moving together like schools of fish as they probe the depths.

To address the overfishing problem and growing worldwide demand for protein, researchers have developed an unmanned underwater vehicle that will fish in the deep ocean rather then in the overfished coastal region. The plan is to use predictable ocean currents (aka 'gyres' ;)) to create enormous, underwater, automated fish farms.